$ git clone -n https://src.fedoraproject.org/rpms/rubygem-sinatra-rabbit.git /var/lib/mock/f45-build-35317-694/root/chroot_tmpdir/scmroot/rubygem-sinatra-rabbit
Cloning into '/var/lib/mock/f45-build-35317-694/root/chroot_tmpdir/scmroot/rubygem-sinatra-rabbit'...
$ git fetch origin 8dcbcac755f8511369917085efe6742a62d9b1ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-sinatra-rabbit
 * [new ref]         8dcbcac755f8511369917085efe6742a62d9b1ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8dcbcac Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild